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UNITED STATES," PATENT OFFTCE.'

THOMAS W. JOHNSON, .OF New YORK, N. Y.

" IMPROVEMENT IN APPARATUS For MAKING ExTnAcTs rRoMlrAN-BAN .Specification .forming partnfwlietters .Patent .Nil gldatefl. .Qtlier--2s 1@- `1 .To all 'whom it may concern: f By the action of these rollers the liquid ad-v Be it known that 1, THOMAS W. JOHNSON, hering to the pulp is squeezed ont and caused ofthe city, county, and State .ot' New York, to tricklel down into the `receivcrliH, from haveinvented a new-andImproved Apparatus which it passes oft' through the pipe I which for Making Extracts of Tan-Bark; and -I do leads back to the saturating-tank. 'The solid hereby declaretlie following to be afuli, clear, portion of vthe pulp, afterhaVing passed andexact description thereof, which will enthrough the squeezing-rollersG, is dumped" able those skilled in the art to make and use into thesecondary saturating-tank. J, whereinv the same, reference being had to the accompait is again exposed to'the action of beaters, soy nying drawings,'forming part of this' specilthat all the astringent properties stillretained cation, in which drawingsby the same are nally dsengagedzj' From Figure 1repres'entsa longitiulinatvertical this secondary saturating-tankthe pulp is re-4 section of this'i n ven tion. Fig. 2 is a plan er moved automatically by the actionof -an eletop view. thereoh Similar lettersindicate corresponding parts. largest portion of the 'liquidudheringftotheV This invention -rclates to certain improvepulp to run back into the satu'rating-tank.

' ments ou an apparatus for making extracts By the action of'the elevator the 'p ulp is .which I have Vdescribed in Letters Patent -dumpedon` an apron, L, which carriesI the granted to me September 15, 1868. sa'meto'the second set oi' squeezing-rollers, M,

vater, K, with wire buckets, which allow the These" improvements consist in the arrange;U 'which' may'bemadeorironororwuocovereW ment ofen additional or secondary saturatingwith hard india-rubber. By the action of these tank and twosets ot' 4squeezing-rol1ers, in com rollers the pulp islsqu'eezed dry, the liquid disbination with thecrushing-rolers, snt-nrating engaged4 theret'rojn beingcollected in a' re-fy tank, and elevator, described in my aforesaid ceiver, N, from which it discharges through a patent, in such-a `manner that vthe pulp of. pipe, U, eitherintothe soaking-.tanks A orinto bark, after having been elevated out ot' the the main saturating-tank,while the spentpulp l'nain saturatingtank, is exposed to theaction is carried olf and used for fuel.' ot' a set ot squeezing-rollers, and after having The operation of extracting the astringent passed through said rollers thepulp (whichin properties can be facilitated by heating the this process is not yet quite exhausted ot' its liquid in the saturatingatanks by means of astringent properties) is dumped intothe secsteamleoils 'or otherwise. ondary saturating-tank, wherein it is exposed By meansot"thisapparatus I have succeeded to the action ot' beaters, so that all the asindisengagingfrom tan-bark allthe astringent tringent properties still retained' by the same properties, or near'ly so,.and the entire operaaredisengaged, and then "the pulp is separated tion is etiected with vthe least possible handfrom the liquor by-means of wire buckets and labor and without the 4expense and delay of` an elevator, and iinally it- (tbe pulp') is passed leaching.4 L. through thelast setofsqueezing-rollers, wliere- I disclaim everything -shown and described by it is squeezed dry and'let'tin a tit condition 'i'n the patent otBenjamin Irving, dated Aprill for fuel. r 30,11867,and numbered 64 -,322,and also every` `A A represent the soaking-tankswhich thing shown und described in Letters Patent serve to soak the bark in the chip. The chips granted to'ine September 15, 1868; but, o f bark, after having been well soaked, are Y 'Having thus described my invention, what passed through between the crushing' rollers I claim a new, and desire to secure by Letters B, and the `crushed or disintegrated barkis Patent, is dumped into the saturatingtank G. -In' this The arrangement 'ot asecondary s aturatingtank the bark-is, exposed tothe action of tank, J, and .two sets of squeezing-rollers, G beaters D, whereby the largest portionot' the M, in combination with the crushing-rollers 'astringent properties contained therein is dis# A, saturating-tank 0,'and elevators E K, all engaged" and 'the bark is converted `into a `substantially in the manner herein shown and Dlpy maSS- 'This pulpis automatically .car described. ried off from the saturating-tahk either by an v THOS. W. JOHNSON. elevator, "E, provided with wire buckets, or 'Y simply by an endless apron, and it is dumped Witnesses: on an apron, F,`from which i-t passes through W. HAUFF,

betweenthe4 first set of squeezingrollers,`G, I E. F. KASTENHUIAER. 

